CVE-2026-128068
Received
Received - Intake
ReDoS in rails-html-sanitizer via SVG href patterns
Vulnerability report for CVE-2026-128068, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-11-13
Last updated on: 2026-11-13
Assigner: GitHub, Inc.
Description
Description
rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. From 1.0.3 through 1.7.1, Rails::HTML::PermitScrubber checks SVG href and xlink:href local references with a pattern whose line-start anchor and whitespace class cause an all-whitespace value to be rescanned from each line start. An attacker who supplies HTML can cause quadratic CPU consumption when an application customizes its allowed tags to include an SVG reference element such as use and permits href or xlink:href. The default allowed tag configuration is not affected. CRuby 3.2 and later uses linear-time regular expression matching for this pattern, while CRuby 3.1 and earlier and JRuby are affected. This issue is fixed in version 1.7.2.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| rails-html-sanitizer | rails-html-sanitizer | From 1.0.3 (inc) to 1.7.1 (inc) |
| rails-html-sanitizer | rails-html-sanitizer | 1.7.2 |
| cruby | cruby | 3.1 |
| cruby | cruby | 3.2 |
| jruby | jruby | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-400 | The product does not properly control the allocation and maintenance of a limited resource. |
| CWE-1333 | The product uses a regular expression with a worst-case computational complexity that is inefficient and possibly exponential. |
